| 项目编号: | 1563025
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| 项目名称: | Collaborative Research: Causes and Consequences of the Gradients in the Vertical Plasma Drift in the Equatorial Plasma Drift Vortex |
| 作者: | Cesar Valladares
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| 承担单位: | University of Texas at Dallas
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| 批准年: | 2016
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| 开始日期: | 2016-09-15
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| 结束日期: | 2019-08-31
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| 资助金额: | 103800
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | plasma density
; plasma bubble structure
; f-region plasma structure
; upward vertical plasma drift rate
; unstable plasma fluid
; plasma depletion region
; f-region plasma layer
; e-region plasma
; equatorial plasma bubble production
; f-region
; equatorial magnetometer measurement
; large equatorial plasma bubble
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| 英文摘要: | At low latitudes during the evening twilight period, as the E-region plasma recombines due to fast chemistry, a strong vertical gradient in the plasma density will appear below the F-region peak height. This vertical drift gradient in altitude below the F peak can be surprising large, dynamic, and variable from day-to-day. This award would apply a physics-based model of the ionosphere-thermosphere-electric field to study the relationship between the development of these vertical gradients and a possible production of plasma bubble structure. In these circumstances the phenomenon of unstable plasma fluids that occur whenever a dense fluid overlies a light fluid will generate strange three-dimensional structures. These plasma depletion regions (often called "bubbles") affect severely communications of radio waves that normally are reflected off the smooth bottom side of the F-region plasma layer. The data that would be used in this study are derived from observations by the Jicamarca Radio Observatory and by the Low Latitude Ionosphere Sensor Network (LISN) network of total electron content and ionosonde measurements of plasma density throughout South America. Also associated with LISN data are equatorial magnetometer measurements that can be interpreted to produce estimates of upward vertical plasma drift rates during the evening period. These results would be used to explore the day-to-day variability of the gradients to help develop a better understanding of the relationship between the rate of vertical drift and the onset of equatorial plasma bubble production. UTD will be utilizing a graduate student to accomplish much of the data analysis and modeling.
Large equatorial plasma bubbles (EPBs), which are associated with the strongest signal scintillations, have negative impacts on communication and navigation technologies. Society has become dependent on these technologies to accomplish common tasks in transportation services, industrial ventures, and military operations. In addition to addressing these important science questions for the mitigation of negative impacts of F-region plasma structures, these activities will continue and expand multinational collaborations associated with the LISN Project and the JRO. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90936
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Cesar Valladares. Collaborative Research: Causes and Consequences of the Gradients in the Vertical Plasma Drift in the Equatorial Plasma Drift Vortex. 2016-01-01.
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